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Define an operon
Name the structural genes of the lac operon
What does the lacI (<-- uppercase i) gene do?

An operon is a group of genes or a segment of DNA that functions in a coordinated matter consisting of an operator, promotor, and structural genes.

The structural genes of the lac operon ...

Define an operon
Name the structural genes of the lac operon
What does the lacI (<-- uppercase i) gene do?

I always hate this question...|I always want to answer based on the parental strand instead of the newly synthesized one and say that it goes 3'->5', instead of 5'->3'(I think this is the answer you're looking for).

The lagging daughter strand is running 3'->5', and the DNA polymerase can only go ...

Correct. Screws have a LOT of friction...

Your turn, chinesesushi

Ok, here goes nothing.

A certain single-helical screw has a head whose diameter is 1/2" and a pitch of 1/10". If you apply 100N to turn the screw (just rotational, no downward force) and the screw drives into the wood below with 141N, what is the screw's efficiency?

A first class lever(to amplify the force), two third class levers (to lower the wedges) and two wedges (to clip the nail)
Wait, wouldn't it be composed of a second class lever (imput on the handle, output on the top wedge, with the cylinder as the fulcrum) and only one 3rd class lever (the bottom ...